ATREND A152-12CP B Box Dual 12-Inch Sealed Subwoofer Enclosure for GM Extended Cab

OEM-Fit Subwoofer Enclosure for GM Extended Cab Trucks

The ATREND A152-12CP B Box is a dual 12-inch sealed subwoofer enclosure crafted to match the interior profile of 1999–2007 Chevrolet and GMC Silverado and Sierra Extended Cab pickups. Thoughtfully designed to sit under the seat without narrowing back-seat space, this enclosure aims to deliver steady bass in real-world driving and daily listening scenarios.

Built for precision and durability

• Dual 12-inch sealed enclosure delivers controlled low-frequency response for a balanced, musical bass experience.
• Special aliphatic resin wood glue creates an airtight seal between MDF parts, with a second application around internal joints after final assembly.
• 3/4-inch thick MDF and CNC-miter construction ensure a tight, rattle-free fit with accurate frequency reproduction.
• Airtight recessed side panels reduce air leaks and vibrations, enhancing overall sound quality without harsh resonances.

Under-seat design and OEM compatibility

Built specifically for under-seat installation, this enclosure maintains an OEM-like appearance and preserves rear-seat usability. The carpeted finish and rounded edges blend with interior styling while concealing the enclosure from view.

• Completely carpeted enclosure with rounded edges for a refined, factory-like look.
• 0.75-inch speaker baffles help emphasize bass response and speaker integrity.
• Engineered for under-seat use in GM extended-cab models, keeping rear seating practical and accessible.

Key specs and fitment

• Sub cutout: 11.125 inches
• Mounting depth: 7 inches
• Front height: 9.25 inches; Rear height: 6.75 inches
• Width: 51.25 inches; Front depth: 14.75 inches; Rear depth: 13.13 inches

What you gain

This enclosure is designed to translate music with clearer bass and reduced enclosure noise, contributing to a more satisfying listening experience. While results depend on your subwoofer choice, amplifier, and vehicle acoustics, the design prioritizes clarity, consistency, and a clean installation. As with any aftermarket upgrade, benefits are possibilities rather than guarantees, but the combination of airtight construction, robust MDF, and under-seat placement aims to support a more enjoyable drive-time soundtrack.